Improved milling-tool



-UNITED STATES PATENT OFFICE.

JOHN BUCKINGHAM AND JOSEPH H. BARD, OF WATERTOVN, CONNEDTICUT,

' ASSIGNORS TO THE SCOVILLEMANUFAOTURING COMPANY.

IMPRovl-:D MILLING-Tool..

T0 all whom t may concern.-

Be it known that we, JOHN BUCKINGHAM and JosEPHH. BAIRD, of Watertown,in the county of Litchfield and State of Connecticut, have invented anew and usefu'limprovement in the apparatus bywhich a rotary die isernployed to impress ornamental or other figures upon metal or othersubstances; and I do hereby declare that the following is a full andexact description of the said improvement.

The rotary die as heretofore employed has been capable of following suchpath only upon the surface to be impressed as it may follow Withoutchange in the position and direction `of the axis about which itrotates.

The purpose of our improvement is to cause the rotary die to follow suchpaths upon the surface to be impressed as demand a vibratory motion inthe axis ofthe rotary die.

Ourimprovement consists in placing the cheeks which hold the axle of'the rotary die A upon another axle, which is at right angles to the axisof rotation and not in the same plane, as is hereinafter more fullydescribed, reference being had to the drawings annexed, and the lettersot' reference marked thereon, making part of this specification.

Drawing No. 1 represents in perspective the tool which is used, DrawingNo. 2 represents the handle or holder into which it is to be fitted, andwhich forms a part of the tool. Drawing No. 3 is a sectional View of thetool and handle properly fitted to each other.

In Drawing No. l, a represents an axle, to which is firmly attached ahead-piece l), or

both can be made in one piece.

c represents another piece of metalfastened to the-head-piece b by meansof the screw e, which Works through a lslot cut in c.

d is the rotary die, its axle being at right angles with the axle d, andplaced out of the line of the axle a to any desired extent by means ofthe slot in c and the screw g.

In order to apply this tool to the use for lwhich it is designed, (asrunning ornamental knurls, beading, or borders or other figures onpicture-frames, daguerreotype-mattings, metal boxes, cases, &c.,) Weplace it in the handle or holderrepresented byDrawingNo.`2,the end t ofthe axle a, entering the eye or hole j,

and another portion of it near the head-piece` resting in the bearing 7aand being kept in place by the shoulder Z, the axle a, with the partsattached to it, being free to move on its own axis. Then fasten thehandle or holder into a rest of the kind ordinarily attached to a lathefor turning metals, and, having fastened the metal or other substanceupon which the figure is to be impressed into the lathe,

bring up the rest in such a manner that the axis ot' the rotary dieWillbe parallel to the surface of the metal to be impressed and itsperiphery in contact therewith. The metal upon which the ligure is tobeimpressed may then be made to revolve with a curvilinearv motion byany known method, as in a circle on a common lathe, or in an ellipse oroval by means of a lathe fitted with eccentric machinery for thatpurpose, in either case the axle a, being free to turn on its own axisand thev center of the die d being out of the line of the axle a, itpermits the die to follow the windings of a c urve by a lateralvibratory or alternating motion. When the path Which the die is tofollow isnot sufficiently determined by the motion of the surface onwhich the impression is to be `made `or by its form,

'a slight preliminary tracing will be sufcient JoHN EUCKINGHAM. JOSEPHH. BAIRD.

Witnesses:

OWEN B. KING, FREDERICK J. KINGSBURY.

